Performance Analysis of Dwdm System With Different Modulation Techique And Photodiode
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1 The International Journal Of Engineering And Science (IJES) Volume 2 Issue 7 Pages ISSN(e): ISSN(p): Performance Analysis of Dwdm System With Different Modulation Techique And Photodiode 1, Anushka Agarwal, 2, Semma Garg 1,2, Department of Electronics & Communication Engineering, Ajay Kumar Garg Engineering College(AKGEC) ABSTRACT For optical transmission application to perform better it become necessary to have small size, low cost, low BER and low power consumption. In this paper the proposed dense wavelength division network (DWDM) system in 1310 nm wavelength domain over a standard single mode fiber transmission system. No nonlinearities in SMF are taken into consideration. Advance optical modulation technique like EAM and QPSK are stimulated and the result prove that using these modulation technique the 1310 nm wavelength domain network are less complex and of low cost. Two different photodiode PIN and APD are tested on the receiver side. For analyzing the effect of amplification both POST amplification and PRE amplification are tested andthe results obtained can be used in the future network for high speed and greater capacity. KEY WORDS : Optical fiber communication, BER,photodiode,wavelength-division-multiplexing and eye opening factor Date of Submission:23 July 2013 Date of Publication:7,Aug, I. INTRODUCTION DWDM technology is a kind of technology that multiplex the optical signal of different frequency and transmit optical signal by using tremendous bandwidth provided by SMF s and DCF. This technology is very useful in optical transmission application that needs to have small size, low power consumption and low cost. DWDM of 100G Ethernet standard work in application of the 1310 nm wavelength domain where 4 25 Gb/s transmission is utilized [1]. Clear eye diagrams at 50 Gb/s transmitted signal after 40 km SSMF using a praseodymium doped fiber amplifier are presented in [2]. Here, we propose the 1310 nm wavelength domain to realize high capacity, low cost and low complexity transmission. The 8 channel DWDM system simulation model is designed in this paper, I part include the introduction, II part discuss about consideration that are taken under system, III part discuss the experimental setup withdifferent modulation technique and photo detection technique at the receiver side. IV and V part discuss result and conclusion respectively. 1: Experimental setup of DWDM system the 1310-nm transmission window. Fig.. The IJES Page 7
2 II. CONSIDERATION Considering the single mode fiber of 1310 nm wavelength domain effected by chromatic dispersion as well as FWM. Taking the dispersion in 1310 domain for SSMF [3] and the tolerance to dispersion is at available bandwidth is the function of fiber length. For the 40 km fiber the fiber value defined in [3]. The channel spacing is taken 250GHz because below 200 GHz the signal is distorted by FWM but dot effecting For 400 Gb/s transmission with the channel spacing of 250 Ghz the higher data rate signal will occupy less bandwidth. The channel spacing can maximum set to 600 GHz and to 500 GHz for the 40 and 50 GB/s signal respectively. These bit rates can apply for 400 Gb/s transmission. III EXPERIMENTAL SETUP Figure 1 shows the experimental setup of the DWDM network that is created and stimulated in the software 3.1.TRANSMITTER:The transmitter side consists of 8 CW laser at wavelength nm the spacing between channel is uniform of 1.4 nm. There is no polarization between the channel the adjacent channel. After CW laser thesignal pass through AWG (arrayed waveguide grating)[5]. AWG channel spacing of 250 GHz is sufficient for the Modulators used in the simulation are EAM and QPSK. Each of the modulator is experimented separately. The modulator are driven by the pseudo random bit sequence of length coming from a pattern generator (PG) and was driven with the electrical signal of the voltage swing 2.4 Vpp and the DC-bias (DC) set to 1.9 V shown in figure 2.Table 1 illustrates the important parameter. Component name DCF of length DCF dispersion value DCF attenuation SSMF of length SSMF attenuation Dispersion at 1310 nm Dispersion slope Specification/ value 2.5 km 42.5 ps/nm 2 db 38.1 km db/km ps/nm*km ps/nm2*km Table 1 After the transmission link, the signals entered a DWDM receiver. The bit rate in the simulation is taken 40 Gb/s. FIGURE 2: simulation model at transmitter side with EAM modulation 3.2.RECEVER At the receiver side to type of output ate experimented one with SOA at the receiver Figure 3 and one without SOA Figure 4.The signal are passed through demultiplexing AWG. The receiver AWG had a loss of 4.5dB.Two photodiode are experimented at the receiver side, figure shows the subsystem at the receiver side each subsystem contain a photodiode, amplifier and a filter and each modulation is experimented with two type of photodiode at the receiver PIN and APD [6] From the above discussion it is clear that for modulation technique is being simulated with different consideration lets discuss each of the setup and also analyze the result that has been calculated. The IJES Page 8
3 FIGURE 4: simulation model at receiver side a) without pre amplification b) with pre amplification I SETUP In first simulation model EAM modulation shown in figure 2. This technique is used which modulate the intensity of laser beam via an electrical voltage. It is used after AWG as shown in the figure using EAM modulation, APD and PIN diode and post and PRE amplification four combinational circuits came in front and the result are shown in table2. EAM PIN EAM APD EAM PIN EAM APD PRE POST POST PRE Signal Power (dbm) Noise Power (dbm) Min. BER 2.54E E E LOG of Min. BER The eye diagram at channel 1 in above four cases are shown in figure 5. Table c)d) FIGURE 5: a)eam PIN POST, b)eam APD POST, c)eam PIN PRE, d)eam APD PRE From the above figures it is clear that POST amplification give the more clear eye diagram and therefore less BER, high eye opening factor and high Q factor can be achieved the best curve is shown by the combination of APD and POST amplification. Still the signal power increases in case of PPE amplification but this will not give as good result as POST amplification. From the table 1 it is clear that APD perform much better than PIN. The IJES Page 9
4 II SETUP In second simulation model QPSK modulation technique.it is used after AWG as shown in the figure 6. QPSK modulation is formed by a common (-vπ, vπ) MZM followed by a (0,π/2) phase modulator (PM) in a serial configuration [6]. FIGURE 6: simulation model at transmitter side with QPSK modulation Using QPSK modulation, APD and PIN diode and post and PRE amplification four combinational circuit came in front and the result are shown below in table 3 QPSK PIN QPSK APD QPSK PIN QPSK APD POST POST PRE PRE Signal Power (dbm) Noise Power (dbm) Min. BER 1.45e e Min. LOG BER TABLE 3 The eye diagram at channel 1 in above four cases are shown in figure 7 FIGURE 7: a)qpsk PIN POST, b)qpsk APD POST, c)qpsk PIN PRE, d)qpsk APD PRE From the above figures it is clear that POST amplification give the more clear eye diagram and therefore less BER, high eye opening factor and high Q factor can be achieved the best curve is shown by the combination of APD and POST amplification. Still the signal power increases in case of PPE amplification but this will not give as good result as POST amplification. From the table 2 it is clear The IJES Page 10
5 FIGURE 8: BER Comparison that APD perform much better than PIN it is also discovered that BER decreases in case of QPSK and EAM has higher BER with a very minute difference in signal power. IV RESULT After transmission there is a very minute difference in the channel power. The eye diagram shown above shows that post amplification show the clear eye diagram and all other channel show the similar performance. Figure 8 shows the BER measurement result. Changing the bit rate to 54 Gb/s the capacity and BER improved but the signal power decreases. Different modulation techniques are simulated and the best result which comes in front in case of QPSK APD POST the BER for all channels is 1.25e-09 was measured figure. The experiments conducted above have eight channels. Adding two more channels does not cause any significant effect in the performance of the network. V CONCLUSION From the above result discussion it is clear that by using APD instead of PIN we can improve the system performance. It was observed that signal power has increased with the decrease in BER but the noise power has also increase significantly with signal power. Eye opening factor and threshold has also improved which give a good eye opening to the eye diagram i.e. the clear eye. From the above result it is clear that QPSK has highest Q factor i.e. its BER will also be less. REFERENCES [1] IEEE 802.3ba-2010 [Online]. [2] T. Fujisawa, et al., 1.3 μm, 50 Gb/s electro absorption modulators integrated with DFB laser for beyond 100G parallel LAN applications, Electron. Lett., vol. 47, no. 12, pp , Jun [3] ITU-T G.652 Characteristics of a Single-Mode Optical Fibre and Cable.(2009, Nov.). [4] Ultra-High-Capacity DWDM Transmission System for 100G and Beyond IEEE Communications Magazine March 2010 [5] Low Complexity up to 400-Gb/s Transmissionin the 1310-nm Wavelength Domain JarosławPiotrTurkiewicz and Huug de Waardt, VOL. 24, NO. 11, JUNE 1, 2012 [6] Performance of 10 Gb/s Optical Receiverin 50-GHz DWDM Transmission over 40-km SSMF WaneeSrisuwarat, JirawutAkaranuchat, Duang-rudeeWorasucheep. The IJES Page 11
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